U.S. patent application number 15/096858 was filed with the patent office on 2016-10-20 for multi-chip touch system and control method therefor.
The applicant listed for this patent is SILICON WORKS CO., LTD.. Invention is credited to Yong Sung AHN, Jung Min CHOI.
Application Number | 20160306465 15/096858 |
Document ID | / |
Family ID | 57129842 |
Filed Date | 2016-10-20 |
United States Patent
Application |
20160306465 |
Kind Code |
A1 |
AHN; Yong Sung ; et
al. |
October 20, 2016 |
MULTI-CHIP TOUCH SYSTEM AND CONTROL METHOD THEREFOR
Abstract
The present disclosure provides a technology related to a
multi-chip touch system. In the multi-chip system, in a case in
which two touch ICs share one receiving electrode and an even
number of receiving electrodes are connected to one touch IC, when
another touch IC senses the shared receiving electrode, the one
touch IC does not connect another receiving electrode, which that
is disposed at the outermost portion, as well as the shared
receiving electrode.
Inventors: |
AHN; Yong Sung; (Seoul,
KR) ; CHOI; Jung Min; (Daejeon, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SILICON WORKS CO., LTD. |
Daejeon |
|
KR |
|
|
Family ID: |
57129842 |
Appl. No.: |
15/096858 |
Filed: |
April 12, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G06F 3/044 20130101;
G06F 3/0446 20190501; G06F 3/0416 20130101; G06F 3/04166
20190501 |
International
Class: |
G06F 3/044 20060101
G06F003/044 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 17, 2015 |
KR |
10-2015-0054195 |
Claims
1. A touch system for sensing proximity or a touch of an object for
a touch panel in which a plurality of areas is divided, the touch
system comprising: a first touch IC configured to generate touch
data for a first area from a sensing signal received from first
receiving electrodes and a boundary receiving electrode; and a
second touch IC configured to generate touch data for a second area
from a sensing signal received from second receiving electrodes and
the boundary receiving electrode, wherein, when the first touch IC
receives the sensing signal from the boundary receiving electrode,
the second touch IC releases the connection with at least one
receiving electrode among the second receiving electrodes and
releases the connection with the boundary receiving electrode.
2. The touch system of claim 1, wherein sensors are formed by
intersections of a plurality of driving electrodes and a plurality
of receiving electrodes, the second touch IC is configured to
provide a driving signal to the driving electrodes, and the first
touch IC is configured to receive the sensing signal from the first
receiving electrodes and the boundary receiving electrode according
to a synchronization signal received from the second touch IC.
3. The touch system of claim 2, wherein the second touch IC is
configured to provide a first driving signal to each driving
electrode during a first time period, and is configured to provide
a second driving signal to each driving electrode during a second
time period, the first touch IC is configured to release the
connection with the boundary receiving electrode during the first
time period, and is configured to receive the sensing signal from
the boundary receiving electrode during the second time period, and
the second touch IC is configured to receive the sensing signal
from at least one receiving electrode among the second receiving
electrodes and the boundary receiving electrode during the first
time period, and is configured to releases the connection with the
receiving electrode and the boundary receiving electrode during the
second time period.
4. The touch system of claim 1, wherein a number of first receiving
electrodes is N (N is a natural number), a number of the second
receiving electrodes is M (M is an odd number), .left
brkt-top.N/2.right brkt-bot. differential amplifiers are positioned
in the first touch IC, .left brkt-top.M/2.right brkt-bot.
differential amplifiers are positioned in the second touch IC-.left
brkt-top.A.right brkt-bot. is a minimum integer not smaller than
A.
5. The touch system of claim 4, wherein a first differential
amplifier among the differential amplifiers positioned in the
second touch IC is connected to two switches, and the remaining
each differential amplifier is connected to four switches.
6. The touch system of claim 5, wherein, when the first touch IC
receives the sensing signal from the boundary receiving electrode,
both of two switches connected to the first differential amplifier
are opened.
7. The touch system of claim 5, wherein, when the second touch IC
receives the sensing signal from the boundary receiving electrode,
both of two switches connected to the first differential amplifier
are closed.
8. The touch system of claim 1, wherein the number of the first
receiving electrodes is N (N is an odd number), the number of the
second receiving electrodes is M (M is an odd number), and when the
second touch IC receives the sensing signal from the boundary
receiving electrode, the first touch IC releases the connection
with at least one receiving electrode among the first receiving
electrodes and releases the connection with the boundary receiving
electrode.
9. The touch system of claim 1, wherein the touch panel includes
even numbers of receiving electrodes, the first touch IC and the
second touch IC share the boundary receiving electrode, the first
touch IC is connected to odd numbers of receiving electrodes, and
the second touch IC is connected to even numbers of receiving
electrodes.
10. The touch system of claim 1, wherein the second touch IC is
configured to receive the touch data for the first area from the
first touch IC, and is configured to transmit the touch data for
the first area to a host by combining the touch data for the first
area with the touch data for the second area, and the first touch
IC is configured to receive the touch data for the second area from
the second touch IC, and is configured to transmit the touch data
for the second area to the host by combining the touch data for the
second area with the touch data for the first area.
11. The touch system of claim 1, wherein each first touch IC and
second touch IC includes a plurality of differential amplifiers, a
first differential amplifier among the plurality of amplifiers
included in the second touch IC is connected to two switches, a
second differential amplifier among the plurality of amplifiers
included in the second touch IC is connected to four switches, the
two switches are connected to two receiving electrodes, and the
four switches are connected to three receiving electrodes.
12. The touch system of claim 11, wherein the second touch IC
further includes a switching signal unit configured to generate a
switching control signal for switches, the switching control signal
is transmitted to the first touch IC, and the switches included in
the first touch IC is controlled according to the switching control
signal.
13. The touch system of claim 1, wherein the number of second
receiving electrodes is M (M is an odd number), the second touch IC
includes a plurality of differential amplifiers, each differential
amplifier is connected to four switches, and the receiving
electrode is not connected to one switch among four switches
connected to a first differential amplifier.
14. The touch system of claim 13, wherein two switches including
the one switch among four switches connected to the first
differential amplifier are always opened.
15. The touch system of claim 1, wherein sensors are formed by
intersections of a plurality of driving electrodes and a plurality
of receiving electrodes, the second touch IC is configured to
provide a driving signal to the driving electrodes, and the second
touch IC is configured to simultaneously provide different types of
driving signals to two or more driving electrodes.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims priority from and the benefit under
35 U.S.C. .sctn.119(a) of Korean Patent Application No.
10-2015-0054195, filed on Apr. 17, 2015, which is hereby
incorporated by reference for all purposes as if fully set forth
herein.
BACKGROUND
[0002] 1. Field of Technology
[0003] The present disclosure relates to a technology for
recognizing a touch on a touch panel using a plurality of touch
Integrated Circuits (ICs).
[0004] 2. Description of the Prior Art
[0005] A touch recognizing technology is a technology for
recognizing an input operation of a user by sensing a signal that
is generated when an object is close to, or contacts, a touch panel
including a sensor. In the touch recognizing technology, various
types such as a magnetic method, a resistive method, and a
capacitive method are used, and recently, the capacitive method has
become the general trend.
[0006] A plurality of sensors are disposed in a touch panel. The
wider a touch area of the touch panel or the higher touch
resolution, more sensors are disposed in the touch panel. Recently,
the number of sensors disposed in the touch panel is being
increased. Accordingly, the area of the touch panel is getting
larger and the resolution of the touch panel is getting higher
simultaneously.
[0007] When the number of the sensors disposed in the touch panel
is increased, a sensing signal may be distributed to process the
sensing signal using a plurality of touch Integrated Circuits
(ICs), rather than processing all sensing signals using one touch
IC. A system in which the sensing signal is distributed and
processed using the plurality of touch ICs as described above is
referred to as a multi-chip touch system.
[0008] Meanwhile, the multi-chip touch system may process the
sensing signal in a differential method. When the differential
method is applied to the multi-chip touch system, a signal process
in the plurality of touch ICs may cause a problem. For example, in
the case of the differential method, two touch ICs are connected
together to a receiving electrode that is positioned in a boundary
area. At this time, a method in which two touch ICs sense the
boundary area receiving electrode without a mutual interference may
cause a problem.
[0009] Meanwhile, in U.S. Pat. No. 8,860,868, a technology for
sensing a touch using a plurality of touch ICs is disclosed.
However, a signal process technology in the differential method is
not disclosed in U.S. Pat. No. 8,860,868.
SUMMARY
[0010] In such a background, an aspect of the present disclosure is
to provide a signal process technology in a plurality of touch ICs
in a multi-chip touch system sensing in a differential method.
[0011] In order to achieve the above-mentioned objects, the present
disclosure provides a touch system for sensing proximity or a touch
of an object for a touch panel in which a plurality of areas is
divided. The touch system comprises: a first touch IC configured to
generate touch data for a first area from a sensing signal received
from first receiving electrodes and a boundary receiving electrode;
and a second touch IC configured to generate touch data for a
second area from a sensing signal received from second receiving
electrodes and the boundary receiving electrode. When the first
touch IC receives the sensing signal from the boundary receiving
electrode, the second touch IC releases a connection with at least
one receiving electrode among the second receiving electrodes and
releases the connection with the boundary receiving electrode.
[0012] As described above, according to the present disclosure, a
plurality of touch ICs may perform an optimal signal process in a
multi-chip touch system sensing in a differential method.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The above and other objects, features and advantages of the
present invention will be more apparent from the following detailed
description taken in conjunction with the accompanying drawings, in
which:
[0014] FIG. 1 is a configuration diagram of a display apparatus
according to an embodiment of the present disclosure.
[0015] FIG. 2 is a view for describing a configuration of a touch
system according to an embodiment of the present disclosure.
[0016] FIGS. 3 and 4 are views for describing a first example for
an internal configuration of a sensing circuit unit of FIG. 2
according to an embodiment of the present disclosure.
[0017] FIG. 5 is a timing diagram of synchronization signals and
driving signals.
[0018] FIG. 6 is a view for describing a second example for the
internal configuration of the sensing circuit unit of FIG. 2
according to an embodiment of the present disclosure.
[0019] FIG. 7 is a view for describing a third example for the
internal configuration of the sensing circuit unit of FIG. 2
according to an embodiment of the present disclosure.
DETAILED DESCRIPTION
[0020] Hereinafter, some embodiments of the present disclosure will
be described in detail with reference to the accompanying drawings.
In the following description, the same components will be
designated by the same reference numerals although they are shown
in different drawings. Further, in the following description, a
detailed description of known functions and configurations
incorporated herein will be omitted when it may make the subject
matter of the present invention rather unclear.
[0021] In addition, terms, such as first, second, A, B, (a), (b) or
the like may be used herein when describing components of the
present invention. These terms are merely used to distinguish one
structural element from other structural elements, and a property,
an order, a sequence and the like of a corresponding structural
element are not limited by the term. It should be noted that if it
is described in the specification that one component is
"connected," "coupled" or "joined" to another component, a third
component may be "connected," "coupled," and "joined" between the
first and second components, although the first component may be
directly connected, coupled or joined to the second component.
[0022] FIG. 1 is a configuration diagram of a display apparatus
according to an embodiment of the present disclosure.
[0023] Referring to FIG. 1, the display apparatus 100 may include a
display panel 130 and a touch panel 110. The display apparatus 100
may include a driver device 140 for driving the display panel 130,
and a touch recognizing device 120 for driving and sensing the
touch panel 110. In addition, the display apparatus 100 may include
a host 150 which may transmit and receive information to and from
the driver device 140 and the touch recognizing device 120.
[0024] In the embodiment described with reference to FIG. 1, the
display panel 130 and the touch panel 110 are separated, but the
present disclosure is not limited to the embodiment. The display
panel 130 and the touch panel 110 may have an integral type in
which the display panel 130 and the touch panel 110 share some
electrodes. For example, the display apparatus 100 may include an
in-cell type panel (not shown). The in-cell type panel (not shown)
has an integral panel type in which a common electrode is used as a
display electrode and is used as a touch electrode. In the
embodiment below, for the convenience of description, the display
apparatus 100 includes each of the display panel 130 and the touch
panel 110, but the present disclosure is not limited thereto.
[0025] In the embodiment described with reference to FIG. 1, the
driver device 140 and the touch recognizing device 120 are
separated, but the present disclosure is not limited thereto. The
driver device 140 and the touch recognizing device 120 may be
combined in one Integrated Circuit (IC) device. Specifically, when
the display apparatus 100 includes an integral panel, a type in
which the driver device 140 and the touch recognizing device 120
are combined may have advantages. For example, in the in-cell type
panel (not shown), a common electrode is used as the display
electrode and is used as the touch electrode. At this time, when
the driver device 140 and the touch recognizing device 120 are
combined, the common electrode may be driven as the display
electrode and may be used as the touch electrode using one driving
circuit. In the embodiment below, for the convenience of
description, the display apparatus 100 includes each of the driver
device 140 and the touch recognizing device 120, but the present
disclosure is not limited thereto as described above.
[0026] The display panel 130 may be implemented based on a flat
display device, such as a Liquid Crystal Display (LCD), a Field
Emission Display (FED), a Plasma Display Panel (PDP), an Organic
Light Emitting Display (OLED), and an Electrophoresis display
(EPD). In an embodiment wherein the display panel 130 is an LCD,
the display panel 130 may include a liquid crystal layer between
two substrates. In such an embodiment, a lower substrate of the
display panel 130 may include a plurality of data lines, a
plurality of gate lines crossing the data lines, a plurality of
Thin Film Transistors (TFTs) formed in a crossing areas of the data
lines and the gate lines, a plurality of display electrodes for
charging a data voltage in liquid crystal cells, a storage
capacitor that is connected to the display electrode to maintain
the voltage of the liquid crystal cell, and the like. In such an
embodiment, an upper substrate of the display panel 130 may include
a black matrix, a color filter, a polarizing plate, and the
like.
[0027] The driver device 140 may convert digital video data RGB
input from the host 150 or a timing controller (not shown) into an
analog positive polarity/negative polarity gamma compensation
voltage, to output a data voltage DATA. The data voltage may be
provided to the data lines. Also, the driver device 140 may
sequentially provide a gate pulse SCAN to the gate lines to select
a line of the display panel 130 to which the data voltage is
written.
[0028] The display panel 130 and the driver device 140 are elements
related to displaying an image on a screen. Continuously, a
configuration related to recognizing a touch in the display
apparatus 100 is described with reference to FIG. 1.
[0029] The display apparatus 100 may include the touch panel 110
and the touch recognizing device 120 for recognizing a touch as a
user operation.
[0030] The touch panel 110 may be attached to an upper polarizing
plate of the display panel 130 or may be formed between the upper
polarizing plate and the upper substrate. In addition, when the
touch panel 110 is formed in an in-cell type, the touch panel 110
may be formed in the lower substrate together with a pixel array in
the display panel 130.
[0031] The touch panel 110 may include driving electrodes,
receiving electrodes and sensors. As an example, the driving
electrodes and the receiving electrodes may be positioned in
different layers and may cross each other-cross structure. In such
a cross structure, the sensors may be capacitors formed in a
crossing area of the driving electrodes and the receiving
electrodes. As another example, the driving electrodes and the
receiving electrodes may be the same layer-1-layer structure. In
such a 1-layer structure, the sensors may be capacitors
horizontally formed between the driving electrodes and the
receiving electrodes. As another further example, the driving
electrode may be the receiving electrode-self structure. In such a
self structure, the sensors may be capacitors formed between the
receiving electrodes and peripheral electrodes. Such a position
relation of the driving electrodes and the receiving electrodes in
the touch panel 110 is just an example, the driving electrodes and
the receiving electrodes may form a position relation that is
different from such examples. All examples of a structure in which
a capacitor is formed between the receiving electrodes and the
peripheral electrodes or between the receiving electrodes as the
sensor, and a capacitance of the capacitor is changed by an object
accessed or contacted to the touch panel 110, may be employed to
the touch panel 110 according to the embodiment of the present
invention.
[0032] Here, the sensors may be referral to as touch sensors since
the sensors sense the object that is close to, or contacts, the
touch panel 110, but the present disclosure is not limited to such
a term. Below, the sensor may be interpreted as meaning the same as
the touch sensor if another modification is not added.
[0033] The touch recognizing device 120 may provide a driving
signal TX to the driving electrodes, may generate a touch
coordinate by sensing a sensing signal RX of the sensor through the
receiving electrodes, and may transmit such touch coordinate data
to the host 150.
[0034] The touch recognizing device 120 may include two or more
touch ICs, and may distribute and process a sensing signal using
two or more touch ICs.
[0035] Since the touch recognizing device 120 uses two or more
touch ICs, the touch recognizing device 120 may be referred to as a
system or a touch system. Below, to increase the understanding of
the disclosure, the touch recognizing device 120 is referred to as
a touch system. But, the present invention is not limited to such a
term.
[0036] FIG. 2 is a view for describing a configuration of a touch
system according to an embodiment of the present disclosure.
[0037] The touch system 120 may include a first touch IC 122 and a
second touch IC 124 as shown in FIG. 2.
[0038] Referring to FIG. 2, the first touch IC 122 and the second
touch IC 124 may include sensing circuit units 210 and 212 that
process a sensing signal by receiving the sensing signal from
receiving electrodes connected to the first touch IC 122 and the
second touch IC 124. In addition, the first touch IC 122 and the
second touch IC 124 may include control units 220 and 222, which
generate touch data and manage overall controls. Below, for the
convenience of description, the sensing circuit unit included in
the first touch IC 122 is referral to as a first sensing circuit
unit 210, and the sensing circuit unit included in the second touch
IC 124 is referral to as a second sensing circuit unit 212. In
addition, the control unit included in the first touch IC 122 is
referred to as a first control unit 220, and the control unit
included in the second touch IC 124 is referred to as a second
control unit 222. But, the first sensing circuit unit 210 and the
second sensing circuit unit 212 may have substantially the same or
a similar circuit configuration, and the first control unit 220 and
the second control unit 222 may have substantially the same or a
similar circuit configuration. Therefore, it should be understood
that embodiments described by separating the first sensing circuit
unit 210 and the second sensing circuit 212, and the first control
unit 220 and the second control unit 222, may be employed to a
different configuration.
[0039] Referring to FIG. 2, the second touch IC 124 may further
include a pulse generating unit 230, a driving circuit unit 240,
and a switching signal unit 250. The pulse generating unit 230, the
driving circuit unit 240, and the switching signal unit 250 may not
be included in the second touch IC 124, and may be included in the
first touch IC 122 in other embodiments. In the below, an
embodiment in which the pulse generating unit 230, the driving
circuit unit 240, and the switching signal unit 250 are included in
the second touch IC 124 is described.
[0040] The driving circuit unit 240 sequentially provides the
driving signal to the driving electrodes TX1 to TX6. For example,
the driving circuit unit 240 may sequentially provide the driving
signal to all driving electrodes TX1 to TX6 according to such a
sequence in which the driving circuit unit 240 provides the driving
signal to the first driving electrode TX1. Next, the driving
circuit unit 240 provides the driving signal to the second driving
electrode TX2. Then, the driving circuit unit 240 provides the
driving signal to the third driving electrode TX3, etc.
[0041] Meanwhile, the driving circuit unit 240 may simultaneously
provide the driving signal to two or more driving electrodes among
the driving electrodes TX1 to TX6. At this time, different types of
driving signals may be provided to the driving electrodes to which
the driving signal is provided simultaneously. For example, driving
signals of which frequencies are different may be provided to each
driving electrode, and driving signals of which codes are different
may be provided to each driving electrode.
[0042] Below, an embodiment is described in which the driving
circuit unit 240 sequentially provides the driving signal to the
driving electrodes TX1 to TX6, but present disclosure is not
limited thereto. As described above, the driving circuit unit 240
may simultaneously provide the driving signal to two or more
driving electrodes using a multiplexing method (e.g., a Frequency
Division Multiplexing (FDM), a Code Division Multiplexing (CDM),
and the like).
[0043] A driving signal output of the driving circuit unit 240 may
be controlled by the second control unit 222, and may be controlled
by a pulse provided from the pulse generating unit 230.
[0044] The pulse generating unit 230 may generate the pulse by a
clock (refer to a reference number CLK of FIG. 5) provided from the
second control unit 222, and may transfer the pulse to the driving
circuit unit 240. In addition, the driving circuit unit 240 may
generate the driving signal using the pulse.
[0045] When the driving circuit unit 240 provides the driving
signal to the driving electrodes TX1 to TX6, the sensing signal
corresponding to the driving signal may be generated in the
receiving electrodes RX1 to RX8. The first sensing circuit unit 210
and the second sensing circuit unit 212 receive the sensing signal
from the receiving electrodes RX1 to RX8.
[0046] When the touch panel 110 is a capacitive touch panel, the
touch panel may include the plurality of driving electrodes TX1 to
TX6 and the plurality of receiving electrodes RX1 to RX8, as shown
in FIG. 2. The sensors may be formed by the crossing of the driving
electrodes TX1 to TX6 and the receiving electrodes RX1 to RX8.
[0047] The capacitances of the sensors may be changed by the
proximity or the touch of the object. The first sensing circuit
unit 210 and the second sensing circuit unit 212 may sense the
capacitance change of the sensors through the sensing signal
received from the receiving electrodes RX1 to RX8. For example,
when the driving signal is provided to the sensor, the capacitance
of the sensor may be changed according to whether the object
touches the touch panel 110, and thus a voltage of a receiving
electrode connected to a corresponding sensor may be changed. The
first sensing circuit unit 210 and the second sensing circuit unit
212 may sense the capacitance change of the sensor connected to a
corresponding receiving electrode by receiving the voltage of the
receiving electrode as the sensing signal.
[0048] The first sensing circuit unit 210 and the second sensing
circuit unit 212 may sense the capacitance change of the sensors,
may convert the capacitance change to a digital value, and may
transfer the digital value to each of the first control unit 220
and the second control unit 222.
[0049] In addition, the first control unit 220 and the second
control unit 222 may generate the touch data using the digital
value.
[0050] Referring to FIG. 2, the first touch IC 122 is connected to
the first receiving electrode RX1 to the fifth receiving electrode
RX5. When an area from the first receiving electrode RX1 to the
fifth receiving electrode RX5 is a first area, the first touch IC
122 may generate touch data for the first area. In addition, the
second touch IC 124 is connected to the fifth receiving electrode
RX5 to the eighth receiving electrode RX8. When an area from the
fifth receiving electrode RX5 to the eighth receiving electrode RX8
is a second area, the second touch IC 124 may generate touch data
for the second area.
[0051] The touch system 120 senses the proximity or the touch of
the object on the touch panel 110, which is divided into a
plurality of areas. In the embodiment of FIG. 2, the touch panel
110 is divided into two areas, the first touch IC 122 generates the
touch data for the first area, and the second touch IC 124
generates the touch data for the second area.
[0052] In order to sense a touch with respect to a whole of the
touch panel 110, the touch data generated from each of the touch
ICs 122 and 124 are required to be combined. To this end, the touch
system 120 may further include a third touch IC (not shown). At
this time, the first touch IC 122 and the second touch IC 124 may
transmit the touch data generated each of the first touch IC 122
and the second touch IC 124 to the third touch IC (not shown). The
third touch IC (not shown) may combine the touch data received from
each of the first touch IC 122 and the second touch IC 124 to sense
the touch for the whole of the touch panel 110. In addition, the
third touch IC (not shown) may transmit fmal result data (e.g.,
touch coordinate information, touch coordinate tracking
information, and the like) to the host 150.
[0053] Meanwhile, the first touch IC 122 may receive the touch data
for the second area from the second touch IC 124, and may combine
the touch data for the second area with the touch data for the
first area to generate the final result data. In this case, the
touch system 120 does not separately further include another touch
IC (e.g., the third touch IC), and may sense the touch for the
whole of the touch panel 110. At this time, the first touch IC 122
transmits the final result data to the host 150.
[0054] On the contrary, the second touch IC 124 may receive the
touch data for the first area from the first touch IC 122, and may
combine the touch data for the first area with the touch data for
the second area to generate the final result data.
[0055] Meanwhile, the first sensing circuit unit 210 and the second
sensing circuit unit 212 may be connected to the receiving
electrodes RX1 to RX8 through switches. The switches may be turned
on or off according to a switching control signal SW of the
switching signal unit 250. For example, the switching signal unit
250 may provide the switching control signal SW to the first
control unit 220 and the second control unit 222, and the first
control unit 220 and the second control unit 222 may control to
turn on or off the switches positioned in the first sensing circuit
unit 210 and the second sensing circuit unit 212 according to the
switching control signal.
[0056] The control for the switches is further described using
internal configurations and operation timings of the first sensing
circuit unit 210 and the second sensing circuit unit 212.
[0057] FIGS. 3 and 4 are views for describing a first example for
the internal configuration of the sensing circuit unit of FIG. 2,
and FIG. 5 is a timing diagram of synchronization signals and
driving signals according to one embodiment.
[0058] Referring to FIG. 3, the first sensing circuit unit 210 of
the first touch IC and the second sensing circuit unit 212 of the
second touch IC may sense the sensors in a differential method
using differential amplifiers D1 to D4. A method of generating the
touch data using a sensing signal difference value of two sensors
is referral to as the differential method. In order to generate the
touch data in the differential method, two receiving electrodes
should be connected to one differential amplifier as shown in FIG.
3. At this time, a pair of two adjacent receiving electrodes may be
connected to one differential amplifier. When one receiving
electrode is simultaneously connected to different differential
amplifiers, since signal interference may be generated between the
differential amplifiers, each of the receiving electrodes RX1 to
RX8 may be connected to one differential amplifier.
[0059] Therefore, in FIG. 3, the first receiving electrode RX1 and
the second receiving electrode RX2 are connected to the first
differential amplifier D1. The third receiving electrode RX3 and
the fourth receiving electrode RX4 are connected to the second
differential amplifier D2. The fifth receiving electrode RX5 and
the sixth receiving electrode RX6 are connected to the third
differential amplifier D3. The seventh receiving electrode RX7 and
the eighth receiving electrode RX8 are connected to the fourth
differential amplifier D4.
[0060] In the differential method, all sensing signal difference
values between two adjacent receiving electrodes should be
received. Therefore, the receiving electrodes RX1 to RX8 are
recombined in a type different from that shown in FIG. 3, and
connected to the differential amplifiers D1 to D4. Referring to
FIG. 4, as another type of the recombination, the second receiving
electrode RX2 and the third receiving electrode RX3 are connected
to the first differential amplifier D1, the fourth receiving
electrode RX4, and the fifth receiving electrode RX5 are connected
to the second differential amplifier D2, and the sixth receiving
electrode RX6 and the seventh receiving electrode RX7 are connected
to the third differential amplifier D3.
[0061] As described above, in the differential method, one
receiving electrode may be connected to one differential amplifier
during one time, and may be connected to another differential
amplifier during another time. As described above, in the
differential method, in order to connect one receiving electrode to
different differential amplifiers during different times, the first
sensing circuit unit 210 and the second sensing circuit unit 212
may include the differential amplifiers D1 to D3 to which four
switches are connected or the differential amplifier D4 to which
two switches are connected, as shown in FIGS. 3 and 4.
[0062] In the differential amplifiers D1 to D3 to which four
switches are connected, two switches may be connected to plus
terminals of the differential amplifiers D1 to D3, and the
remaining two switches may be connected to minus terminals of the
differential amplifiers D1 to D3. In addition, three adjacent
receiving electrodes may be connected to the differential
amplifiers D1 to D3 to which four switches are connected. At this
time, one receiving electrode may be connected to a switch
connected to the minus terminals of the differential amplifiers D1
to D3, and another receiving electrode may be connected to a switch
connected to the plus terminals of the differential amplifiers D1
to D3. In addition, a remaining receiving electrode positioned
between two receiving electrodes may be connected to another switch
connected to the minus terminal, and may be further connected to
another switch connected to the plus terminal. For example, the
differential amplifier D1 is connected to four switches S1 to S4.
The first switch S1 and the second switch S2 are connected to the
minus terminal, and the third switch S3 and the fourth switch S4
are connected to the plus terminal of the differential amplifier
D1. Also, the differential amplifier D1 may be connected to three
adjacent receiving electrodes RX1 to RX3. The first receiving
electrode RX1 is connected to the first switch S1 that is connected
to the minus terminal of the differential amplifier D1, the third
receiving electrode RX3 is connected to the fourth switch S4 that
is connected to the plus terminal of the differential amplifier D1,
and the second receiving electrode RX2 is connected to the second
switch S2 that is connected to the minus terminal of the
differential amplifier D1 and the third switch S3 that is connected
to the plus terminal of the differential amplifier D1.
[0063] In the differential amplifier D4 to which two switches are
connected, one switch S13 connected to the minus terminal of the
differential amplifier D4 may be connected to one receiving
electrode RX7, and another switch S14 connected to the plus
terminal of the differential amplifier D4 may be connected to
another receiving electrode RX8.
[0064] Referring to the timing diagrams of FIGS. 2 and 5, the
second control unit 222 may generate the clock CLK in order to
determine a driving signal period. The pulse generating unit 230
may generate the pulse for the driving signal according to the
clock CLK. For example, the pulse generating unit 230 may generate
the driving signal to the first driving electrode TX1 in
synchronization with a rising edge of the clock CLK at a first time
point, may generate the driving signal to the second driving
electrode TX2 in synchronization with the following falling edge of
the clock CLK, and may generate the driving signal to the third
driving electrode TX3 in synchronization with the following rising
edge of the clock CLK. According to such a method, the pulse
generating unit 230 drives one driving electrode during a half
period of the clock CLK.
[0065] The pulse generating unit 230 may generate the pulse by
dividing a driving period for one driving electrode into two
driving periods again. For example, the pulse generating unit 230
may divide the driving period for the first driving electrode TX1
into two driving periods, may generate a first driving pulse Tx1a
in a first time period, and may generate a second driving pulse
Tx1b in a second time period. In addition, the first control unit
220 and the second control unit 222 may connect the receiving
electrodes RX1 to RX8 to the differential amplifiers D1 to D4 by
controlling the switches as shown in FIG. 3 with respect to the
first driving pulse Tx1a, and may connect the receiving electrodes
RX1 to RX8 to the differential amplifiers D1 to D4 by controlling
the switches as shown in FIG. 4 with respect to the second driving
pulse Tx1b.
[0066] At this time, the switching signal unit 250 may transmit a
switching control signal SW for a switching control of another
touch IC 122 to another touch IC 122, in synchronization with the
pulse output from the pulse generating unit 230 or the driving
signal output from the driving circuit unit 240. For example, the
switching signal unit 250 may generate the switching control signal
SW of which a rising edge is synchronized at a start time point of
the first driving pulse Tx1a and a falling edge is synchronized at
a start time point of the second driving pulse Tx1b, and may
transmit the switching control signal SW to another touch IC 122.
In an embodiment of the present disclosure, the switching signal
unit 250 is positioned in the second touch IC 124, and thus the
switching signal unit 250 may transmit the switching control signal
SW to the first touch IC 122.
[0067] Referring to FIG. 5, the switching signal unit 250
alternately generates a first switching control signal SW1
corresponding to the first driving pulse Tx1a and a second
switching control signal SW2 corresponding to the second driving
pulse Tx1b. The switching control signal SW is transferred to the
first control unit 220 of the first touch IC 122. The first control
unit 220 controls the switches S1 to S8, as shown in FIG. 3, in a
period of the first switching control signal SW1, and controls the
switches S1 to S8, as shown in FIG. 4, in a period of the second
switching control signal SW2.
[0068] The second touch IC 124 also controls switches S9 to S14 as
shown in FIG. 3 in the period of the first switching control signal
SW1, and controls the switches S9 to S14, as shown in FIG. 4, in
the period of the second switching control signal SW2, in
synchronized with the switching control signal SW directly and
indirectly. At this time, since the second touch IC 124 is a touch
IC generating the switching control signal SW, although the second
touch IC 124 does not identify the switching control signal SW, the
second touch IC 124 may detect a state of the switching control
signal SW. For example, since the second touch IC 124 includes the
pulse generating unit 230, which is a source of the switching
control signal SW, the second touch IC 124 may directly and
indirectly detect the state of the switching control signal SW
through a signal of the pulse generating unit 230. In addition,
since the signal of the pulse generating unit 230 is generated from
the clock CLK of the second control unit 222, the second control
unit 222 may autonomously detect the state of the switching control
signal without a detection of another signal. The second control
unit 222 may control the on and off states of the switches S9 to
S14 that are positioned in the second touch IC 124 using the
detected switching control signal SW.
[0069] Meanwhile, referring to FIGS. 3 and 4 again, an odd number
of receiving electrodes are connected to the first sensing circuit
unit 210 of the first touch IC, and an even number of receiving
electrodes are connected to the second sensing circuit unit 212 of
the second touch IC. A difference generated in a circuit
configuration and a control of each touch IC according to the
number of the connected receiving electrodes is described in more
detail.
[0070] The number of receiving electrodes positioned in the touch
panel 110 may be an even number. When the number of the receiving
electrodes positioned in the touch panel 110 is the even number as
described above, an even number of receiving electrodes are
connected to at least one touch IC in the differential method. For
example, as the embodiment of FIGS. 3 and 4, in a case wherein the
number of the receiving electrodes RX1 to RX8 is eight, when five
receiving electrodes RX1 to RX5 are connected to the first sensing
circuit unit 210 of the first touch IC, four receiving electrodes
RX5 to RX8 are connected to the second sensing circuit unit 212 of
the second touch IC.
[0071] Even in a case in which the number of the touch ICs forming
the touch system 120 is three or more, an even number of receiving
electrodes are connected to one touch IC. For example, when the
total number of the receiving electrodes is 12, in order to connect
three touch ICs in the differential method, the touch ICs should be
connected to five receiving electrodes, five receiving electrodes
and four receiving electrodes, respectively.
[0072] When odd number of receiving electrodes are connected to the
touch IC, the receiving electrodes may be sensed using the
differential amplifiers D1 and D2 connected to four switches, as in
the first sensing circuit unit 210 of the first touch IC of FIGS. 3
and 4. However, when even number of receiving electrodes are
connected to the touch IC, at least one differential amplifier D4
may be connected to two switches and the remaining differential
amplifier D3 may be connected to four switches, as in the second
sensing circuit unit 212 of the second touch IC of FIGS. 3 and
4.
[0073] In respect of a control, the differential amplifier to which
four switches are connected and the differential amplifier to which
two switches are connected may be differently controlled. Such a
difference of the control is described with reference to FIGS. 3
and 4 again.
[0074] For the convenience of description, the fifth receiving
electrode RX5 positioned in a boundary of the first area and the
second area is referred to as a boundary receiving electrode, the
receiving electrodes connected to the first touch IC 122 except for
the boundary receiving electrode are referred to as first receiving
electrodes RX1 to RX4, and the receiving electrodes connected to
the second touch IC 124 except for the boundary receiving electrode
are referred to as second receiving electrodes RX6 to RX8.
[0075] Referring to FIGS. 3 and 5, the first touch IC 122 releases
the connection with the boundary receiving electrode RX5 in a first
time period corresponding to the first switching control signal
SW1, and receives the sensing signal from the first receiving
electrodes RX1 to RX4. To this end, the first control unit 220
closes odd-numbered switches S1, S3, S5 and S7, and opens
even-numbered switches S2, S4, S6 and S8.
[0076] The boundary receiving electrode RX5 is connected to the
second touch IC 124 in the first time period. At this time, the
second touch IC 124 receives the sensing signal from the boundary
receiving electrode RX5 and the second receiving electrodes RX6 to
RX8. To this end, the second control unit 222 closes a ninth switch
S9, an eleventh switch S11, a thirteenth switch S13 and a
fourteenth switch S14, and opens a tenth switch S10 and a twelfth
switch S12. That is, the second control unit 222 closes the
odd-numbered switches S9 and S11 and opens the even-numbered
switches S10 and S12 with respect to the differential amplifier D3
to which the four switches are connected in the first time period.
However, the second control unit 222 closes both of two switches
S13 and S14 with respect to the differential amplifier D4 to which
two switches are connected.
[0077] Referring to FIGS. 4 and 5, the first touch IC 122 is
connected to the boundary receiving electrode RX5 and receives the
sensing signal from the boundary receiving electrode RX5 in a
second time period corresponding to the second switching control
signal SW2. In addition, the first touch IC 122 releases the
connection with the first receiving electrode RX1 positioned in an
outermost in a direction opposite to that of the boundary receiving
electrode RX5, among the first receiving electrodes RX1 to RX4, and
receives the sensing signal from remaining receiving electrodes RX2
to RX4. To this end, the first control unit 220 closes
even-numbered switches S2, S4, S6 and S8, and opens odd-numbered
switches S1, S3, S5 and S7.
[0078] As a result, the first touch IC 122 to which an odd number
of receiving electrodes RX1 to RX5 are connected synchronize the
odd-numbered switches S1, S3, S5 and S7 and the even-numbered
switches S2, S4, S6 and S8 in different time periods, to perform on
and off controls.
[0079] Meanwhile, the second touch IC 124 releases the connection
with the boundary receiving electrode in the second time period,
releases the connection with the eighth receiving electrode RX8
positioned in the outermost in a direction opposite to that of the
boundary receiving electrode RX5, among the second receiving
electrodes RX6 to RX8, and receives the sensing signal from
remaining receiving electrodes RX6 and RX7. To this end, the second
control unit 222 closes even-numbered switches S10 and S12 and
opens odd-numbered switches S9 and S11 in the second time period
with respect to the differential amplifier D3 to which four
switches are connected. However, the second control unit 222 opens
both of the switches S13 and S14 with respect to the differential
amplifier D4 to which two switches are connected.
[0080] As a result, with respect to the differential amplifiers D1
to D3 to which four switches are connected, the switches connected
to each differential amplifier may be divided into odd-numbered
switches and even-numbered switches, and may be controlled to be
turned on and off by synchronizing the odd-numbered switches and
even-numbered switches in each time period. However, with respect
to the differential amplifier D4 to which two switches are
connected, two switches should be controlled to be turned on and
off by synchronizing two switches in each time period.
[0081] Meanwhile, the number of the differential amplifiers
positioned each touch IC may be determined according to the number
of the remaining receiving electrodes except for the boundary
receiving electrode RX5. For example, when the number of the first
receiving electrodes connected to the first touch IC 122 is N (N is
a natural number), .left brkt-top.N/2.right brkt-bot. differential
amplifier may be positioned in the first touch IC 122. When the
number of the second receiving electrodes connected to the second
touch IC 124 is M (M is a natural number), .left brkt-top.M/2.right
brkt-bot. differential amplifier may be positioned in the second
touch IC 124. Here, .left brkt-top.A.right brkt-bot. means a
minimum integer not smaller than A.
[0082] At this time, M is an odd number, as described above, one of
the differential amplifiers positioned in the second touch IC 124
may be connected to two switches, and each remaining differential
amplifier may be connected to four switches. In addition, if one of
the differential amplifiers is connected to two switches, when the
first touch IC 122 receives the sensing signal from the boundary
receiving electrode, both of two switches may be opened, and when
the second touch IC 124 receives the sensing signal from the
boundary receiving electrode, both of the two switches may be
closed.
[0083] When N is an odd number and M is an odd number, the first
touch IC 122 may include the differential amplifier to which two
switches are connected, and the first touch IC 122 may be operated
as a mechanism that is equal to that of the second touch IC 124.
For example, in this case, when the first touch IC 122 receives the
sensing signal from the boundary receiving electrode, the second
touch IC 124 releases the connection with at least one receiving
electrode among the second receiving electrodes and the boundary
receiving electrode. When the second touch IC 124 receives the
sensing signal from the boundary receiving electrode, the first
touch IC 122 also releases the connection with at least one
receiving electrode among the first receiving electrodes and the
boundary receiving electrode.
[0084] In the first example described with reference to FIGS. 3 and
4, the differential amplifier D4 to which two switches are
connected is positioned in the outermost in the direction opposite
to the direction of the boundary receiving electrode RX5, but the
differential amplifier D4 may be positioned in another
position.
[0085] FIG. 6 is a view for describing a second example for the
internal configuration of the sensing circuit unit of FIG. 2
according to one embodiment.
[0086] Referring to FIG. 6, in the second sensing circuit unit 212
of the second touch IC, the fourth differential amplifier D4
connected to two switches S13 and S14 is positioned in a direction
that is equal to that of the boundary receiving electrode, and the
third differential amplifier D3 connected to fourth switches S9 to
S12 is positioned in a direction that is opposite to that of the
boundary receiving electrode.
[0087] In such a configuration, operation methods of the switches
S1 to S14 are described. First, when a time period when the
boundary receiving electrode RX5 is connected to the second touch
IC 124 is a first time period, and a time period when the boundary
receiving electrode RX5 is connected to the first touch IC 122 is a
second time period, the on and off of the switches S1 to S8
positioned in the first touch IC 122 in the first time period and
the second time period are controlled as the description with
reference to FIGS. 3, 4 and 5.
[0088] For example, the first touch IC 122 releases the connection
with the boundary receiving electrode RX5 in the first time period
corresponding to the first switching control signal SW1, and
receives the sensing signal from the first receiving electrodes RX1
to RX4. To this end, the first control unit 220 closes the
odd-numbered switches S1, S3, S5 and S7, and opens the
even-numbered switches S2, S4, S6 and S8. In addition, the first
touch IC 122 is connected to the boundary receiving electrode RX5
and receives the sensing signal from the boundary receiving
electrode RX5 in the second time period corresponding to the second
switching control signal SW2. In addition, the first touch IC 122
releases the connection with the first receiving electrode RX1
positioned at an outermost portion in a direction opposite to that
of the boundary receiving electrode RX5, among the first receiving
electrodes RX1 to RX4, and receives the sensing signal from
remaining receiving electrodes RX2 to RX4. To this end, the first
control unit 220 closes the even-numbered switches S2, S4, S6 and
S8, and opens odd-numbered switches S1, S3, S5 and S7.
[0089] In contrast, the on and off of the switches S9 to S14
positioned in the second touch IC 124 are controlled differently
from the description with reference to FIGS. 3 and 4.
[0090] For example, the boundary receiving electrode RX5 is
connected to the second touch IC 124 in the first time period. At
this time, the second touch IC 124 receives the sensing signal from
the boundary receiving electrode RX5 and the second receiving
electrodes RX6 to RX8. To this end, the second control unit 222
closes the tenth switch S10, the twelfth switch S12, the thirteenth
switch S13, and the fourteenth switch S14, and opens the ninth
switch S9 and the eleventh switch S11. That is, the second control
unit 222 closes the even-numbered switches S10 and S12 and opens
the odd-numbered switches S9 and S11 with respect to the
differential amplifier D3 to which the four switches are connected
in the first time period. However, the second control unit 222
closes both switches S13 and S14 with respect to the differential
amplifier D4 to which the two switches are connected. In addition,
the second touch IC 124 releases the connection with the boundary
receiving electrode RX5, releases the connection with the eighth
receiving electrode RX8 positioned in the outermost portion in the
direction opposite to that of the boundary receiving electrode RX5
among the second receiving electrodes RX6 to RX8, and receives the
sensing signal from the remaining receiving electrodes RX6 and RX7.
To this end, the second control unit 222 closes the odd-numbered
switches S9 and S11 and opens the even-numbered switches S10 and
S12 with respect to the differential amplifier D3 to which four
switches are connected in the second time period. However, the
second control unit 222 opens both of two switches S13 and S14 with
respect to the differential amplifier D4 to which two switches are
connected.
[0091] Meanwhile, in the first example and the second example of
the sensing circuit unit described with reference to FIGS. 3, 4 and
6, the circuit configurations of the sensing circuit units of two
touch ICs 122 and 124 are different. However, for the ease of
design or compatibility between the touch ICs, the circuit
configurations of the sensing circuit units of two touch ICs 122
and 124 may be the same.
[0092] FIG. 7 is a view for describing a third example for the
internal configuration of the sensing circuit unit of FIG. 2
according to one embodiment.
[0093] Referring to FIG. 7, both of the first sensing circuit unit
210 of the first touch IC and the second sensing circuit unit 212
of the second touch IC include the differential amplifiers D1 to D4
to which four switches are connected.
[0094] Meanwhile, in such a configuration, since the number of the
receiving electrodes connected to the second touch IC is smaller
than the number of the receiving electrodes connected to the first
touch IC (e.g., by 1), the receiving electrode is not connected to
one pin (hereinafter, `NC pin`) of the second sensing circuit unit
212 of the second touch IC.
[0095] In such a configuration, the first touch IC 122 may control
to turn on and off the switches S1 to S8 in a method that is the
same as that of the first example and the second example.
[0096] In contrast, the second touch IC 124 may control the
switches S9 to S12 and S15 to S18 somewhat differently from the
first example and the second example.
[0097] First, in the first time period when the second touch IC 124
is connected to the boundary receiving electrode RX5, the second
touch IC 124 closes the odd-numbered switches S9 and S11 and opens
the even-numbered switches S10 and S12 among the switches S9 to S12
connected to the third differential amplifier D3. In addition, in
the first time period, the second touch IC 124 closes the
odd-numbered switches S15 and S17 and opens the even-numbered
switches S16 and S18 among the switches S15 to S18 connected to the
fourth differential amplifier D4. That is, the second touch IC 124
closes the odd-numbered switches S9, S11, S15, and S17 and opens
the even-numbered switches S10, S12, S16, and S18 in the first time
period with respect to all differential amplifiers D3 and D4.
[0098] In the second time period when the second touch IC 124
releases the connection with the boundary receiving electrode RX5,
the second touch IC 124 closes the even-numbered switches S10 and
S12 and opens the odd-numbered switches S9 and S11 among the
switches S9 to S12 connected to the third differential amplifier
D3. In addition, the second touch IC 124 opens all switches S15 to
S18 connected to the fourth differential amplifier D4 in the second
time period. That is, in the second time period, the second touch
IC 124 opens all switches S15 to S18 with respect to the
differential amplifier D4 connected to the NC pin, and closes the
even-numbered switches S10 and S12 and opens the odd-numbered
switches S9 and S11 with respect to the differential amplifier D3
to which the NC pin is not connected.
[0099] In another point of view, in the differential amplifier D4
to which the NC pin is connected in the second touch IC 124, two
switches S16 and S18 are always opened, and the remaining two
switches S15 and S17 are controlled to be turned on and off
according to the time period.
[0100] In the above, embodiments in which two touch ICs are used in
the touch system 120 are mainly described, but two or more touch
ICs may be used in the touch system 120. Even in a case in which
two or more touch ICs are used, the embodiments described above may
be employed. For example, when a first touch IC, a second touch IC,
and a third touch IC are employed in the touch system 120, the
embodiments described above may be applied to a relation between
the first touch IC and the second touch IC, and may be applied to a
relation between the second touch IC and the third touch IC.
[0101] In the above, an embodiment in which five receiving
electrodes RX1 to RX5 are connected to the first touch IC 122 and
four receiving electrodes RX5 to RX8 are connected to the second
touch IC 124 is described. However, more receiving electrodes may
be connected to each of the touch ICs 122 and 124. For example, 401
receiving electrodes may be connected to the first touch IC 122 and
400 receiving electrodes may be connected to the second touch IC
124. At this time, the boundary receiving electrode may be
understood as the receiving electrode together connected to the
first touch IC 122 and the second touch IC 124, that is, the
receiving electrode sharing the first touch IC 122 and the second
touch IC 124.
[0102] As described above, in a multi-chip system sensing the touch
of the touch panel 110 using two or more touch ICs, an even number
of receiving electrodes may be connected to one touch IC.
Specifically, when the multi-chip touch system senses the touch in
a differential method, a control for connecting the receiving
electrodes to the differential amplifier becomes an important
issue. In the embodiment described above, for such a control, a
control technology wherein the second touch IC releases the
connection with at least one receiving electrode and the boundary
receiving electrode when the second touch IC connected to even
number of receiving electrodes is not connected to the boundary
receiving electrode, that is, when the first touch IC receives the
sensing signal from the boundary receiving electrode, is
provided.
[0103] When the first touch IC and the second touch IC
simultaneously sense the boundary receiving electrode, a distortion
may be generated in the sensing signal by a mutual interference.
However, according to the control technology proposed in the
above-mentioned description, such interference may be removed.
[0104] In addition, when the receiving electrode is connected to a
differential amplifier that should not receive the sensing signal,
a problem may be generated in which noise may flow through a
corresponding differential amplifier or damage may be generated
through the corresponding differential amplifier. However,
according to the control technology proposed in the above-mentioned
description, such a problem may be removed.
[0105] In addition, since terms, such as "including," "comprising,"
and "having" mean that one or more corresponding components may
exist unless they are specifically described to the contrary, it
shall be construed that one or more other components can be
included. All the terms that are technical, scientific or otherwise
agree with the meanings as understood by a person skilled in the
art unless defined to the contrary. Common terms as found in
dictionaries should be interpreted in the context of the related
technical writings not too ideally or impractically unless the
present invention expressly defines them so.
[0106] Although a preferred embodiment of the present invention has
been described for illustrative purposes, those skilled in the art
will appreciate that various modifications, additions and
substitutions are possible, without departing from the scope and
spirit of the invention as disclosed in the accompanying claims.
Therefore, the embodiments disclosed in the present invention are
intended to illustrate the scope of the technical idea of the
present invention, and the scope of the present invention is not
limited by the embodiment. The scope of the present invention shall
be construed on the basis of the accompanying claims in such a
manner that all of the technical ideas included within the scope
equivalent to the claims belong to the present invention.
* * * * *